I never caught the reference, even after I knew where to look for it, it wasn't until someone all out said it to me that I was like "Oh, yeah..."
As for the station, I thought someone answered to who destroyed what, but for an answer? It didn't need an entire episode, a line of dialogue, especially in the episodes directly pertaining to the existance of B5, or even showing B4, when Sinclair and Garibaldi were on the station and talking to the CO, and he was saying all hell is going loose, he could have said something like "We know it's not the Grigari (random name), because there's no signs of Iron Emissions (random technobabble) anywhere near the station..."
Anyhoo, as other's said I guess it's mostly trivial, but the kind of trival that could have easily been answered.